defmodule NDCConfig do
  def check_mandatory_provider_config(config) do
    if is_nil(config[:label]) || is_nil(config[:server][:url]) || is_nil(config[:rest][:generic_headers]) || is_nil(config[:ndc]) do
      raise ConfigError
    else
      config
    end
  end
  def load_provider_config(provider) do
    case Application.fetch_env(:ndc_ex_gateway, String.to_atom(String.downcase(provider) <> "_config")) do
      {:ok, config} -> check_mandatory_provider_config(config)
      :error -> raise ConfigMissingError
    end
  end
  # def load_provider(path), do:  path |> test_file_exists |> read_file |> expose_provider_config |> check_mandatory_provider_config
  # def load_consumer(path), do:  path |> test_file_exists |> read_file |> expose_consumer_config
  # defp test_file_exists(path) do
      # {status, _} = File.read("#{path}/config.exs")
      # if status === :error do
        # raise ConfigMissingError
      # else
        # path
      # end
  # end
  # defp read_file(path), do: Mix.Config.read!("#{path}/config.exs")
  # defp expose_provider_config(provider_config), do: provider_config[:PROVIDER]
  # defp expose_consumer_config(consumer_config), do: consumer_config[:CONSUMER]
end

defmodule ConfigError do
  defexception message: "Configuration file is malformed or missing required data."
end

defmodule ConfigMissingError do
  defexception message: "Configuration file is missing."
end